To ride comfortably and have good power output in the drops - one major thing you need to do is......ride in the drops. You will (generally speaking) get used to (more comfortable) and get stronger at what your are in the habit of doing the most of. Yes we all have different amounts of flexibility, some may say they have a bad back to hide the fact that their gut gets in the way, etc. But until you try to make something a habit it won't be a habit.
Train the way you intend to play.
Required output to maintain 45 kph on a TT:
Standard road bike, hands on hoods = 465 Watts
Same bike, hands down on the drops = 406 watts
Same bike with aero bars = 369 Watts
Same bike, triathlon position (5.5 cm lower bar, saddle forwards)= 360 Watts
Same bike, as above, with 2 tri spoke wheels = 345 Watts
The most significant gain in the above figures is basic changes in body position - not equipment......
After you look at the saddle to bar drop in the pictures - note that I am 53 years old and unless I'm cruising in the middle of a pack like those pros that were referenced by the OP.....I ride greater than 50% in the drops......
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So I'll say it again.......Train the way you intend to play.